#9.5 Drilled Rubber Stopper (DRS)
Our #9.5 Drilled Rubber Stopper (DRS) is a pure white gum laboratory stopper that has a top diameter of 1 13/16", a bottom diameter of 1 1/2", and a 3/8" hole drilled in the center, the perfect size for an airlock.
This stopper fits most 2000 mL Erlenmeyer flasks.
The #9.5 rubber stopper is also available as a #9.5 solid rubber stopper.
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